this is how i have them routed in my b18b1 in my si. not exactly like your a1 but should give you an idea. the blue line is where the map vacuum line would go assuming i didnt have a tb mounted map sensor. the yellow is for the purge solenoid that goes to the evap canister. the thick red vac line outlined with yellow goes from the vac canister, to the top of the throttle body. the dark orange line behind the tb goes down to the vac purge valve. the light blue vac line is for pcv, and on the farthest to the right the brown outlined vac line goes to the fpr.
i included the vacuum routing diagram for the a1 as well.
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